RDMA/irdma: Fix deadlock during netdev reset with active connections

Resolve deadlock that occurs when user executes netdev reset while RDMA
applications (e.g., rping) are active. The netdev reset causes ice
driver to remove irdma auxiliary driver, triggering device_delete and
subsequent client removal. During client removal, uverbs_client waits
for QP reference count to reach zero while cma_client holds the final
reference, creating circular dependency and indefinite wait in iWARP
mode. Skip QP reference count wait during device reset to prevent
deadlock.

Fixes: c8f304d75f6c ("RDMA/irdma: Prevent QP use after free")
Signed-off-by: Anil Samal <anil.samal@intel.com>
Signed-off-by: Tatyana Nikolova <tatyana.e.nikolova@intel.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>

diff --git a/drivers/infiniband/hw/irdma/verbs.c b/drivers/infiniband/hw/irdma/verbs.c
index 9920a3304be3d6d11614935a05241fe0bd48f892..95f590c10c051563dac98045a5774543a6724678 100644 (file)
--- a/drivers/infiniband/hw/irdma/verbs.c
+++ b/drivers/infiniband/hw/irdma/verbs.c
@@ -558,7 +558,8 @@ static int irdma_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata)
        }
 
        irdma_qp_rem_ref(&iwqp->ibqp);
-       wait_for_completion(&iwqp->free_qp);
+       if (!iwdev->rf->reset)
+               wait_for_completion(&iwqp->free_qp);
        irdma_free_lsmm_rsrc(iwqp);
        irdma_cqp_qp_destroy_cmd(&iwdev->rf->sc_dev, &iwqp->sc_qp);